Combined telegraph and telephone system.



. I 65x; a k Lilli] c 0. L. BOPP. COMBINED TELEGRAPH AND TELEPHONE SYSTEM. APPLIGATIGR FIIJIID NOV. 27, 1909v 1,044,981 Patented Nov. 19, 1912.

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UNITED STATES rATEN'r orsics.

- CLINTON L. norr', or HAWKEYE, IOWA.

COMBINED TELEGRAPH AND TELEPHQNE SYSTEM.

P of Letters Putt-nicd Nov. ll). 1912.

Applicotion filed November 27, 1909. Serial No. 530.219.

this it will be observed that induction coil To all whom it may concern: or suppressing low frequent-v current of Be it known that I, CLINTON L. BOPP, a the telegraphic instruments, hut using or citizen of the United States, residing at permitting the telephonic and ringing curllawkeye; in the county of Fayette and rents operating the telephonic instrliments State of Iowa,.have invented certain new and the hell or howler. 55 and useful Im rovements in Combined In order that the invention muv be more Telegraph-and elephone Systems; and I clearly understood un emhodimeht of the do hereby declare'the following to be a full, same is shown in the ziccompanving drawclear, and exactdescription of the invenmgs, in which 1 indicates a line wire to tion, such as-will enable others skilled in the which the telegraph set A connected. and 60 art to which it appertains to make and use telephone set B is also connected. ()f the same. v course, it will be understood that a plural- This invention relates to ,im rovements in ity of telegraph sets A are connected to line i signaling devices, and partiou arly to means wire 1. and also a plurality of telephone for using the same line wire for telegraph sets B are connected to the some wire. The 65 and telephone sets'at the same time, and has telegraph set A is of any desired kind, prefas one of the objects means which will eleeerably of the Morse type, and is connected trically -kill the telegraphic impulses leakto line wire 1 by wire 2. An impedance ing into the telephone sets. coil 3 is interposed in wire 2 for preventing A still further object of the invention is the high frequency currents of the telephone 70 thenrrangem'ent in a combined telephone device or sets from entering the telegraph and telegraph system, of telephone sets insets. The telephone set B is connected with eluding a balanced system for causing the line wire 1 by wire 4 through binding post electrical killing of telegraphic im ulses and 5, and is also connected with the ground by for diverting the telephonic impu ses to one wire 6 through binding post 7. It will of 75 side of the balanced system for actuating course be evident that instead of using the the telephonic instruments. ground as a return a metallic return could With these and other'objects in view the be provided. A wire 8 extends from hindinvention comprises certain novel construe ing post 5 and is connected to a secondary tions, combinations, and arrangement of winding of induction coil 9. Induction coil 30 parts, as will be hereinafter more fully de- 9 in turnhas the secondary winding thorescribed and claimed. of connected with wire 10 which extendsto .In the accompanying drawings: Figure 1 a binding post 11 on'one sideof a ringing is a diagrgimmatical view of. u telegraphic socket 12. Connected to wire 10 between and telephonic set connected to the same line binding post 11 and induction coil 9 -is a s5 wire. 2 is u'detail fragmentary view wire 13 which extends to a binding; post 14 of a core and encircling wires embodying and then divides into branches 15 and 16. certain features of the invention. Branch 15 is provided with an impedance In constructing and arranging the comcoil 17 -and branch 16 is provided with an bined telephone and telegraph sets, tel'cohmic resistance 18 so that the branches not so graph instruments of any desired kind may somewhat on the order of the \Vhentstone be used. but those of the Morse type :n'e bridge. The branches 1? and 16 are conprefergbiep An impedance coil is inserted nectcd at their ends to binding posts 1.) andbetween the telegraph sets and the line wire 20 from which extend wires El and 2-2.- for preventing the comparatively high frc- Wire 2} is formedinto winding 23 of inducquency telephone and ringing currents from tion coil 24. A wire 25 extends from windentering the telegraph instruments. Con' ing 22-5 to a binding post '26 and wire 22 exnected to the same line wire as the telegraph tends to the same binding post after forminstruments area plurality oftelephonic ining winding 27 of induction coil 24. From struments and issociated devices for killing 24 has a c'ore 28, a secondary winding 29, and two 'primary windings, namely windings 23 and 27.- The wind1ngs23 and 27 are wound in'the same direction but current passing therethrough after dividing at binding post 14 will pass in opposite directions so as to neutralize the magnetic effect of the current flowing therethrough, and thus not affect the receiver 30 or transmitter 31.

The ohmic resistance of impedance coil 17 and resistance 18 is the same, and the ohmic resistance of windings 23 and 27 is the same, so that telegraphic current entering into the telephonic system will be equally divided between windings 23 and 27, and consequently there will be no influence brought to bear on the telephone receiver and transmitter by the telegraphic current.

A howler or bell is used and arranged to operate in the usual manner of such in struments for signaling preparatory to phoning, the specific construction of the bell or howler being of the usual kind, but improved means and an improved arrangement of circuit is provided for adapting the same to the telephone set.

i In order that the'invention may be more clearly understood, the .circuit will be traced when sending a telegraph message, and then when sending a telephone message. Starting with a telegraph battery or source of current 32, current will pass through the key 33 in successive impulses as the circuit is made and is again broken in the usual manner. From key 33 the current passes through the usual telegraph instruments, as for instance. sounder 34, and resistance 35. A condense". 36 may be connected across the key 33, and the condenser 37 may connect wire 2 to the ground. After current. has passed through sounder 34 the same will pass through wire 2 to line wire 1, through an impedance coil 3. As the telegraphic current is of low frequency the impedance.

coil 3 will have substantially no effect thereon, and will permit the free passage therethrough. After. reaching line wire 1 the current passes along the same to the various telegraph instruments connected to line Wire 1, and operates the same in the usual manner. In passing along line wire 1 some of the current will leak down line 4 to binding post 5. .From binding post 5 the current 'will pass through wire 8 into the secondary {Winding of induction coil 9. From the (secondary winding of induction coil 9 the current will pass through wire 10 to wire 13. As the current passes through wire 13 the same divides at binding post 14, and an equal amount passes through wires or branches 15 and 16 as the same are of the same ohmic resistance. From branches 15 and 16 the divided current passes eventually if the windings 23 and 27 were not arranged asdescribed a click would be heard in the telephone instrument. From this it will be observed that the telegraph instruments may operate freely, and without affecting the telephone receiver.

If it is desired to use the telephone set either while the telegraph set is being operated or at another time, the plug 38 is pushed in for moving members 39 and 40 into contact with members 41 and 42. This will cause current to flow from battery 43 through wire4'4, wire 45, member 39, member 41, wire 46, adjusting member 47, make and break tongue member 48, binding post 49, wire 50, and the primary winding of induction coil 9, and wire'51 back to battery 43. The make and break will, of course, cause an induced current to be generated in the secondary winding of induction coil 9, whereby a current is passed therefrom through wire 8, binding post 5, wire 4, and line wire 1. From line wire 1 the current will pass into a telephone set similar to telephone set B for operating the bell thereof or the howler, and from thence to the ground. From the ground the current will pass through wire 6, binding post 7, to,con denser 53. From condenser 53 a current will pass through wire 54, hook 55, wire 56, wire 57, member 42, member 40, and wire 10, back to the secondary winding of induction coil 9. After the bell has been thus rung telephone receiver 30 is removed from hook 55, which will cut out the bell circuit, and switch in the teleph-me circuit. Thev receiver 30 is connected with a local circuit through binding posts 58" and 59.

The local circuit comprises wire 60, winding 29, wire 61, binding posts 58 and 59 and receiver 30. If the receiver, similar to r5- ceiver 30, of the second telephone set is taken off-its hook current will flow from the battery -rent passes over line wire 1, through wire 4, binding post 5, wire 8, the sccondarywinding of inductioncoil 9, wire 10, wire 13,; binding post 14, branch 16, resistance 18,;

binding post- :QO, wire '22, winding 2?, binding post 26, wire 62, hook 55, wire -54, and condenser 53. From condenser 53 a current is passed to binding post :1, wire 6., to the ground. and-through the to ground back to the battery. As thecurrent passes, from binding post l-l the same will pass thr'ough'resistance 18, which is a noninductive resistance, rather than pass? throu h the impedance coil 17, so that coil- 27 will be energized, and influence the local circuit of receiver 30, whereby 'a sound will be reproduced in thereceiver 30. At the same time (receiver 30 being ,otl its. hook) current Will'flOW from battery 43., through' wire 51, theprimary of induction coil 9,

wire 50, binding. 0st 49, wire 63,:transmitter 31, wire "64, inding post v26', wire 62, hook 55, wire 65, wire 52, back to battery 48. Of course it will be understood thatthe corresponding telephone to telephone set Bwill beinfluenced by inducedc'urrent in the secondary winding of induction coil tlbybattei'yj lti. .qwhen the corresponding telephone set, 30 similar to" telephone set B, desires to .com municate' with a telephone set B,-.a plug, similar to plug 38, is inserted intoa. similar to socket 12, and surrounding part;:l

sothat a ringing current will pass over line;-

wire 1. From line wire 1 the ringing-cur rent'will pass to binding post 5, through wire (36, howler or hell 67, wire 57, wire 56; hook 55, which of course is in a lowered condition, receiver 30 being suspended there- 40 from. wire 54, and condenser 53. From condenser 53'current will pass to binding post 7, and from binding post 7 through wire 6 to the ground. and from the ground back to its source. This circuit is completed,

of course, only temporarily and sutliciently long for attracting notice. The circuit, of course, is opened when the receiver 9.0. is removed from hook 55. The plugs 38 of telephone sct B andithe corresponding telephone set. are removed. immediately after the ringing-of the hell or sounding of the howler. f

The induction coil 24 is made with a rorec28 in' the usual manner, and is pro- 56 vided with What appears as a single wind ing, as shown in Fig. 2. but which in elfect are the wires; of windings 23, 27 and 29 wound parallel.

In illustrating the invention only one telc 6O graph set A is shown, and one telephone set Bis shown. but of course it. will be understood, that two or more of each set must be connected to line wirie 1 for signaling each otheriiw It also willbe observed that both devices may he used at the same iim jwith- "1 out interference, or at dill'crent time; as desired, so that eiLhl-r may he used uhsolutely imlependcntly of the other and with out detrimental rlh-cl to cithcr dcvi c. in effect the telephone set B would he atlachwl To to tlieordinauv telegraph wires now in u--c. without in the least disturbing lhelclcgraph instruml'nts, so that .in establishing new rolephone lines no expense is nccdssary cxccpt the expense of the telephone sets. and the permission to use the telegraph wires. This can be done, and yet the click of thc telegraph instruments not he heard by the telephone, as impulses of the telegraph system are eliminated.- ln the use of induction coils so any. desired hind may be used, as induction coil 9, but preferably the type patented by me February 12, 1907, Number 844,250.

Vhat I claim is:

1;A combined telegraph and telephone system comprising a common line conductor, telegraph and telephone station apparatus connected therewith by independent conductors, an impedance disposed in the conductor to the telegraph station adapted to "prevent thepassage' of current from the ielcphone station the said telephone station apparatu's comprising two induction coils, the first induction coil havingasecondary wind- I ingcommunicatingwith the conductorleading to the common line and thesecond induction coil comprisinga primary conductor and two secondary conductors all wound in the same direction, a line extending from the secondary winding of the .first coil and dividing and connected with both of the secondary windings of the second induction coil at opposite ends, resistances introduced into the divided lines of like ohmic resistance. one of said resistances being provided with inductive impedance. a transmitter apparatus connected with the primary winding of the first induction coil and: a receiver co'nneetedwith the primary winding of the second induction coil, 1

2. A combined telegraph and telephone system comprising a common line conductor, telegraph and telephone stations communieating with the common conductor-by independentconductors," an -inductive impedance in the telegraph conductor adapted to prevent the passage of telephone currents, two induction coils located in the telephone station the first induction coil comprising a primary and secondary winding the secondary Winding being in communication with the conductor leading to the common line, a battery,'a receiver hook and a trans- .mitter, a circuit including the battery, transmitter, receiver hook and primary 12 winding, :1 receiver in circuit with the primary winding of the second induction coil. said second induction-coil having-two secondary windings, the secondary windings branches of the divided line, and an impeand the primar winding being wound in dance introduced into one of the resistances. 10 the same. directlon, a line extending from In testimony whereof I affix my signature the secondary winding of the-first inducin presence of two witnesses.

lion coil and dividin and communicating CLINTON L. BOPP.

with opposite .-nds o the secondary windings of the second induction coil, resistances of like ohmic resistance introduced into the Witnesses MAYME MURRAY, LEO PAGE. 

